only 2 kinds of rifleing I'm aware of, broached or cut rifleing, and button rifleing, cut rifleing uses a cutter and removes metal, button uses an oversized sped to more or less iron the rifleing into the barrel. There is canted land and progressive twist but they are just varients of cut rifleing. hammer forging involves useing a hammer mill to make a piece of steel round and tapered, they still have to be rifled.
RR
[ol][*]Broach[*]Button[*]Cut rifle[*]Hammer Forged[*]EDM[/ol]
Broach is all the grooves are
cut into the barrel in a single pass
Button a carbide button with the lands impression is pulled or pushed thru
forming grooves and lands
Cut rifle or single point involves making multiple cuts just to make one groove on a barrel
Hammer Forged ...forging a steel blank that is substantially shorter then the finished product. A specially machined mandrel is inserted into the blank that is pre-drilled it is placed in the hammer mill and in the process the barrel lengthens and can be tapered or full diameter whatever the machine is programmed for.
EDM --electrical discharge manufacturing
Broughton barrels are canted land and arebutton rifled other custom button manufacturers also make canted land barrels
Ridge, there is an additional type of rifling called Mandrel Rifling. It consist of placing a very hard mandrel
ITS CALLED HAMMER FORGING
in the barrel and then forging the barrel around the mandrel which pounds the barrel down against the mandrel leaving a rifling impression. It has been abandoned due to excessive stresses being left in the barrel which result
Thats why Remington,Sako,Winchester,Browning,Tikka,CZ and Ruger use the process
in the barrel walking with each shot as it heats up and very rounded transitions from the lands to the grooves. I think there is also an electronic type of rifling out there that erodes the metal instead of cutting it.
It's called EDM and it is mostly used in Pistol barrels
At anyrateI do not know of any manufacturer that actually uses either. I would elaborate your point about the Hart barrels and point out that the majority of match winning barrels are hammer forged
and then button rifled.
This is the largest reach I have seen yet..try running a carbide button thru a hammer forged barrel and see what types of results that will have.
The idea that button rifling is inferior toother methods completely contradictsactual match results.
No one said that button rifling is not accurate AGAIN READ MY POSTS .I would say that almost 100 % if not 100 % of target shooters use button rifled barrels someone that knows more about match shooting and benchresting would know a more exact figure as I am going by popular manufacturer names that do button rifles. Now I know for a fact that custom barrel especially the ones that button rifle don't use the Savage method of making a button rifle barrel. I'll describe the procedure for you...They get a round piece of steel , they deep drill it as straight as they can, They ream the hole to the final caliberdimension and then they insert the carbide button which is pushed on almost all of them thru the blank or pulled(Schneider barrels) . It is then lapped to remove any tool marks. You think Savage does that on each barrel ?
Anyway this post is gettingreal old. Scot I want you to call Hart and ask them if they hammer forge then button rifle their barrels when you have a chance. Do it after the poor guy has his morning coffee otherwise he may spew all over his keyboard. Signals crossed up my ARse